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MDADM 3TB RAID1 add continous 6TB RAID

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I have software RAID1 with SDA + SDB (3TB). I make them via this commnad:

sudo mdadm --create --verbose /dev/md0 --level=1 --raid-devices=2 /dev/sda /dev/sdb

and this mirror RAID working nice.

Now I have plans to make another mirror RAID (6TB), eg. like this:

sudo mdadm --create --verbose /dev/md1 --level=1 --raid-devices=2 /dev/sdc /dev/sdd

And now I want to add new 6TB (md1) space to avaible 3TB (md0),to make summed space to 9TB.

I want to also have option to add (grow) another summed space in future and create "dynamic linear matix from RAIDs1"

Is to possible to do?

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